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Scuttlefish

Sprocket Removal

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Hi,

In general does the bolt securing the sprocket / clutch  on a chainsaw ( in this case old  Makita DCS6000i ) have a  right hand thread or is it a left hand ( like the drive side end  of a bike bottom bracket ). I need to change the sprocket which is pretty tight on and just want to make sure I am applying force in the correct direction ......

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Hi,

In general does the bolt securing the sprocket / clutch  on a chainsaw ( in this case old  Makita DCS6000i ) have a  right hand thread or is it a left hand ( like the drive side end  of a bike bottom bracket ). I need to change the sprocket which is pretty tight on and just want to make sure I am applying force in the correct direction ......

It is not a bolt, the end of the crankshaft is threaded and the clutch is like a huge nut. The thread is set so that it tightens as the saw cuts rather than undoing, so has to be left hand.

 

Have you found just a sprocket or do you have a new drum as well? Changed the rim sprocket on my PS6000i but the drum will want doing next time and I think they are obsolete.

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Most sprockets spin off clockwise (left hand thread) unless there is a separate securing nut but this is generally found on vintage saws only.

If you can't shift it - Use a big air impact driver - it will shift it PDQ.

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Just a short sharp blast with the impact gun, too much and it is possible to shear the flywheel key, i speak from experience.

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2 minutes ago, adw said:

Just a short sharp blast with the impact gun, too much and it is possible to shear the flywheel key, i speak from experience.

Got that t-shirt as well, cept mine was cast into flywheel so new flywheel req

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On 12/06/2019 at 23:26, Dan Maynard said:

Have you found just a sprocket or do you have a new drum as well? Changed the rim sprocket on my PS6000i but the drum will want doing next time and I think they are obsolete.

Looks like the clutch for dcs6000/6800 is obsolete but the drum is still available. .... didn't look too hard, part shop direct.co.uk  Had me worried there. 

 

 

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Ah that's good - didn't even try an original part, I was looking for the Oregon drum which they appear to have stopped making - or at least that's what I concluded last year.

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